Modelling and experimental study of impedance spectra of electron beam physical vapour deposition thermal barrier coatings

Deng, Lifen; Xiong, Y.; Xiao, Ping

doi:10.1016/j.surfcoat.2007.03.012

Cited by 16 publications

(12 citation statements)

References 34 publications

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“…With increase in the TGO thickness, TGO peak rises and shifts to higher frequency. The variation trend is in agreement with the results obtained by Deng et al [21]. Because of the effect of TGO thickness, the measurement errors of YSZ and TGO thickness are given in Table 3.…”

Section: Error Of Thickness Measurement Using Asymmetric Electrodesupporting

confidence: 91%

“…A three-dimensional model is constructed for the TBCs specimen. Due to the good conductivity of the bond coating and substrate, their influence on the IS distribution can be neglected in the model [21]. Only ceramic coating and TGO layer are included in the model.…”

Section: Geometric and Materials Parametersmentioning

confidence: 99%

“…Several experimental investigations find that both electrode geometry and size have the significant effect on impedance feature [9,19,20], and sometimes asymmetric electrode geometry can lead to the spread of an electrical conduction region in TBCs, while it is not reliable to find it in experiments and not to present to measure the divergence of electric field quantitatively. Using finite element method, Deng et al [21] investigated the effects of TGO growth and conductivity on the IS distribution of TBCs produced by the electron beam physical vapor deposition. The finite element simulation is an effective method to study the influences of asymmetric electrode on IS distribution.…”

Section: Introductionmentioning

confidence: 99%

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Error and modification in thermal barrier coatings measurement using impedance spectroscopy

Yang

Zhu

et al. 2017

Ceramics International

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A B S T R A C TIn impedance spectroscopy testing of metal/ceramic multi-layers, such as thermal barrier coatings (TBCs), in order to avoid electric leakage, asymmetric electrode is widely adopted. However, how is electric field distribution in asymmetric electrode system, what error does it bring to measurement results, and how to modify these errors etc., are still not understood. In this study, electric field divergence in TBCs measurement induced by asymmetric electrode is investigated through solving a three-dimensional electric field equations numerically. The results show that the asymmetric electrode inevitably triggers divergence of electric field line, and as frequency decreases the divergence increases considerably. When Pt electrode diameter is chosen as 1 mm in ceramic coating, the errors in thickness measurement for both YSZ and TGO are 26.20% and 89.3%, respectively. The errors rise as both YSZ and TGO thicknesses increase, while the errors decrease as Pt electrode size increases. The error in thickness measurement for TGO layer is much larger than that for YSZ. Through present research, a scheme to eliminate the effect of electric field divergence on measurement error is proposed.

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Section: Error Of Thickness Measurement Using Asymmetric Electrodesupporting

confidence: 91%

Section: Geometric and Materials Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Error and modification in thermal barrier coatings measurement using impedance spectroscopy

Yang

Zhu

et al. 2017

Ceramics International

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“…Descriptions of the boundary conditions and calculation procedures can be found in Ref. [14,15]. Geometric models and physical parameters used for the calculation are described in part 3.3.…”

Section: Methodsmentioning

confidence: 99%

Electrical properties of YSZ/Al2O3 composite and YSZ/Al2O3 interface studied by impedance spectroscopy and finite element modelling

Yang¹,

Zhao²,

Xiao³

2010

Solid State Ionics

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“…This method was used by Ogawa et al 14 to study the formation of the reaction layer in the APS TBCs during aging treatments and detect cracks within the YSZ topcoat 24 . It was also adopted by Xiao and colleagues to monitor the growth of TGO under isothermal heat treatments and thermal cycling, 25–28 the sintering and phase transformations of the YSZ topcoat, 29 and cracks at the TGO/BC interface 30 …”

Section: Introductionmentioning

confidence: 99%

Nondestructive Evaluation of Thermal Barrier Coatings Using Impedance Spectroscopy

Yang

Xiao

2009

Int J Applied Ceramic Tech

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This article reviews previous studies on nondestructive evaluation of thermal barrier coatings (TBCs) using impedance spectroscopy (IS). IS or electrochemical impedance spectroscopy has been widely used to measure the electrical properties of materials and electrochemical behavior at electrode/electrolyte interfaces. TBCs, which comprise metallic and ceramic multilayers, have been widely used in the hot section of aeroturbine engines to increase turbine efficiency and to extend the life of metallic components. Since 1999, IS has been developed to examine degradation of the TBCs as a nondestructive evaluation tool, which is critical for prediction of TBCs lifetime during service. IS has been used both at high temperature in dry environments and in aqueous solutions. Impedance spectra of TBCs reflect change in TBC thickness, porosity, cracks, sintering, and yttria-stabilized zirconia phase transformation. Meanwhile, impedance measurements indicate the thermally grown oxide growth and the failure in TBCs. In addition, the thermal conductivity of TBCs can be correlated to impedance measurement results.

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Modelling and experimental study of impedance spectra of electron beam physical vapour deposition thermal barrier coatings

Cited by 16 publications

References 34 publications

Error and modification in thermal barrier coatings measurement using impedance spectroscopy

Error and modification in thermal barrier coatings measurement using impedance spectroscopy

Electrical properties of YSZ/Al2O3 composite and YSZ/Al2O3 interface studied by impedance spectroscopy and finite element modelling

Nondestructive Evaluation of Thermal Barrier Coatings Using Impedance Spectroscopy

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